ARS FASTCAST/HIGHSPEED CONFIGURATIONS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP88-00893R000200080003-2
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 5
• Document Creation Date: December 12, 2016
• Document Release Date: May 17, 2002
• Sequence Number: 3
• Publication Date: April 7, 1980
• Content Type: MFR

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iease 2~~/61'f9 : CIA-RDP88-0089000200080003-2
7 April 1980
MEMORANDUM FOR THE RECORD
SUBJECT: ARS FASTCAST/HighSpeed Configurations
25X1A 1. A meeting was held at 0 on April 4, 1980 to redefine
the requirements for ARS stand-alone operation and to further
coordinate the activation schedule. It was mutually agreed that if
part of the Phase II requirements, ie (courtesy copy and spills
be altrouted to ARS) can be completed with minimum effort that
ARS will be activated at the completion of Phase I. Testing will
begin approximately 1 June 1980 and the software will be ready
30 Jun 1980. Activation will take place in early July if all of
the above testing is satisfactorily completed.
25X1A 2. 0 expressed concern for software support and requested
that an ARS programmer be on site for the early July activation date.
25X1A
25X1A
3. requested that
4. Attached is a detailed discussion of the hardware requirements
25X1 A for the ARS at
0
25X1,
25X1A
25X1A
D/Uhlet, Engineering
circuit requirements
be sent to him NLT 15 May. 0 OPS agreed to have the above
information available for the 1 May meeting which has been scheduled
for review of plans and progress. The meeting will take place at
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HARDWARE NOTES FROM 4 APRIL 80 ARS MEETING
1. A 2400BPS and possibily 4800 BPS MTU to LTU (B-10) trunk will
serve as the communications link between MAX III and ARS II. Back-
up for this link will be in form of normally unused MFU's and
LTU's (B-10) such as WASH, ARS II to ARS V trunk or ARS II to MAX II
25X1 trunk which can be patched at 0 to form a MAX III TO ARS II
trunk.
2. Establishing a "virtual" trunk between MAX III and ARS II,
dedicated to passing CRT and Line Printer data, will be worked
out during Phase II. In the into rm, after activation of ARS II,
the "spills" and "curtesy copies" in MAX III will simply be
alt-routed to ARS II via the normal trunk. Some discussion
about the possibility of a loop developing between the systems
will be investigated.. ARS must detect the same spill error as
MAX or ARS will return the message to MAX and cause a circle.
3. Up to 20 "Fastcast" and "Modem Emulator" (high speed) circuits
and an undetermined number of low speed's are to be activated.
during Phase I. It was emphasized that there was some uncertainty
in the actual number of 2400 BPS circuits ARS could simultainausly
support. The prob4-bility that a staggered service would all for the
use of 20 LTU's (B-10) was discussed. The final answer lies in
actual testing.
4. ARSR and ARSO will be alt-routed to MAXR and MAXO. This will
eliminate the need for two teletype terminals. being located in the
Operating area.
5. The removal of one IIAX Highspeed Line Printer upon activation
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 25X1
25X1
of Phase I will allow for the installation of the two ARS Medium
Speed Line Printers in the operating area of the
6. ARS II Supervisory Control Console and Message Control Console
will be located in the operating area in the vicinity of the MAX III
control positions. Silent 700 teleprinters, operating at 300 BPS
ASCII, will be installed.
7. The third Medium Speed Line Printer, which was 'a part of
MAXCON, will be removed from the ARS bus configuration, but main-
tained as a spare (located in the equipment room of the
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8. The MAXCON pseudo LTU rack and associated line switch will be
left in the ARS bus configuration for the time being so the programmers
can determine its usefulness in software developement.
will make LTU location/assignment information available
to the programmers as soon as possible. All due care will be taken
.to extablish a proper distribution of Control, Monitor, Synchronous
High Speed, "Fastcastm and Low Speed circuits so failure of any
shelf within the LTU cabinet will not totally disable the system.
10. A Superbee III will be used as ARS II High Speed software
monitor at 2400 BPS ASCII asynchronous, serviced from a B-8A LTU.
This is to be implemented during Phase II. This High Speed Monitor
may possibly serve as MAX III High Speed Monitor via the "virtual"
circuit.
11. Some discussion as to the possibility of using Silent 700's
at 300 BPS for Low Speed Monitors was left up in the air. The
programmers will check into the problem of Baudot to ASCII code
25X1 conversion. I
12. The B-6 LTD's exchanged with MAX 1A, which do not have
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redundant addressing logic, were briefly discussed with the
subject deferred to COMSEC.
13. The MAXCON Record Channel Interface cards will be removed
from the ARS II bus configuration. It is possible these are the
same cards used in DATEX.
14. The MAXCON Superbee III CRT's may be used with ARS II Spill
positions. This matter to be investigated jointly"by the
Technician and HQ programmers prior to activation. In either case
B-8A LTU's will be used.
X1
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